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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c1475c6dd7a8c5e5fd1ddc284446b31f5355c19299cd8e2a23843b1ba39e952e' 
  AND token = '815bnzF2u3mK5q9GJwOFlScbuGbpRI/Q7Uq9PCL9dsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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