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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f25d79c0a5427300b4e6e82d43e3b5b41e7083544a80a782e484c06084f99553' 
  AND token = 'Cl4kWgGoKfeAReCIvpLrmKojdM6PXg7vZNPxhR3gjRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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