Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a396a8fcd1fdd1d7a2898539d2bc3f6080f9ae53072e898bdf3eaf6d9d676d61' 
  AND token = 'RjfRYpmDctDozNF0uFM+M7yjBBzQC47nCexMYmB+8L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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