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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '316f02738dafb0ca6842f8d9d55da8b644ae9c5c1f66f65ec2dfb7da9c8282d1' 
  AND token = 'mHJIm0emmRGncMI1R/wUKpdRoX+V2VK4Q95UL0vxB5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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