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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd369e405895bffde48550edb6a07e11e6ded15d7138dbf8dc7e11744b855d3dd' 
  AND token = '1XlqPecAcJWqbQmcCX5lh3llwOnxKPd0eLDAGKib5UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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