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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d11e6f3b0004a947c7cfdf1ddaaa55cbabc4c17ac6a9cb03dffb2d976f3263f' 
  AND token = 'Mq/NeHrr9po0aVapkbzId1dIZudfaOBHxjuV2jhfs8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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