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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '413fa6a2888acabbafd301a021a973949a462a69a260ba53a7ada037400b6d06' 
  AND token = '4pWSrxcCFAEYvCrXpjm0yKC4IKzJV2l5dQTq/Mp+NtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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