Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3249c10c69ede36d698807aa210700516b1ce8f70df856f6e0000f2223680e40' 
  AND token = '7568OfM6RpmXLFJK2AXl2hQXeUaPbkvnd7wdDWpTBWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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