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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f818f88c2ac175b60afbb3364a6ac451a7b994d1ee9aa48504f400e7a0b7989f' 
  AND token = 'yy7v9k2U3t16BREV0DDEa7pW9AStLuJPFYAwRIebu9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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