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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94b673f03c39c68c1fe3dd4f7c330c41857e7c9b76af08701c0bd25da7ff52b3' 
  AND token = 'UToXKP4A01d2Oeb+tk90c2goMF8d7jAptgvFADckeOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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