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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fad9c8bb1ca7c07b3a632e90aa9c82a7a372fcadc9c31b72dfae1584574b782' 
  AND token = 'mVlRZFOLDkbc7bBoppNCbf+YEGdeUl8O7N+qbLcp9lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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