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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '657926e6f8c8f104fd88bddc8354afcc4a987e44d0046a14d31656c1bd25b29c' 
  AND token = 'aaeP6UPNbiieHnBYFNaB1kKuEMNgrPp5grs57daGbL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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