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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'af3b8ed837534e445544ef9de1e54aa652cbca4e3abf3259a79ee4831063764b' 
  AND token = 'D5zpJINYc//sytaPdMNFpSqE5bjWNccIHZc2Kf2CBGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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