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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '701da03b301f69c71ceb26bc02e256fefa132543aa4289c78fdf40a03fb74942' 
  AND token = 'iTtoiJ/s5yFypSvMXlUNMfYimCDxh9E0Sk1L5xsksjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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