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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '471f38fdd9bdfa7cc6cf5e8e767afa75bc849e32631e47c29eac38e71af64a5e' 
  AND token = 'EBU+qDiJ+dLAEkmvE1tyLYw9eNWn+U1MHh9JigINhb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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