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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dcd30813de726d759b0f91e9601c0d76f9237116ab0b0a106a71731eb013d84f' 
  AND token = 'anlFqQ5EsPAxQmaEMnt/UOo7laI7umFu2oXVn4arTRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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