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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94812e9c6ffc07e86bcdf0e3eed18955d9f482f0e15ac29933ecc2cf28b6a2a3' 
  AND token = '9P2xHilVsrEVP0MtO6EKMtBF5gwlcetp9QBNxXmqwZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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