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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '031a0f27f4b6d35c0f5b7b897a4282cb44c1b68866d48b804a87dfa3e693375a' 
  AND token = 'NgJsZxMrGiAq6eYtSkHRAm0iI0ko3atQEcWFl9m/S0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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