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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1a2e8db5a9ae893af34a220761210743a9951b57f3de2deade81c093b2d1da2' 
  AND token = 'j0EGBa0sh6RQBalup3u3D2cTwr8PN5rnh6DIWYAsYqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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