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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6d506f4cad09e8f33081538803acd34a0afffaf89a437132a9820d7ea7a80f3c' 
  AND token = 'xoi8gnJIvlwY+LmNAMouL+bor3I7DkzQ26ivCG5Dqe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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