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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de0e929c9de64f3c418698b7226841079cb39bbdec6dfdd5848377a8f846dd0c' 
  AND token = 's4i6QxyP2crDS0lW8mIEpYZGGseZ14Y8h3P4LGd4TyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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