Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1cc9891c7fecbe889dfcc44b0d6342f3ff6c18e6850aedf43b924c4562413b' 
  AND token = 'Vt5CNrjbHDi5/TkUIVTtQkc2WrUYA2+SpjQfcNF6rT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}