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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c635da9177b27fadb58dcace97a69b60ff62920e7139dfe40f554a96fcea738a' 
  AND token = 'ThrUUHkwYltun6ZvjHCMIa91ZUOZveLz8sHHSsXNroc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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