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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6eed833505fafbb2c843eca08d94fc6c8622eea14f671297b5aa04c127e3e4a6' 
  AND token = 'QGsqMh/etlsmI1Djsf94ZCYe3XtUy5+cwy1TAGH99ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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