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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fec58baf646a88a45da2532dd3a3edcebccec06783fc3c52930b8a8aed718f7' 
  AND token = 'E+PDd3urHMFXJL097RO+vfpNeWNAn0/4LrFZ0VPyO4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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