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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f23a0d6ac6c550df8fdf972f79e954feb35709a37580cc3b8b2ef3f0012d188' 
  AND token = 'Tdgwqd8ATMZ0G3sm1s9xt8DYtbqb9sRSu8GfjOEsJaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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