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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c687d04ec54e89fe1cc867c8123d7165eafbed54bfa167987b722edbdccf6406' 
  AND token = 'Oyb8eyJzQKVdzObUrw3aefkNuFh0pRst4Qp+XqaJtbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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