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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4d0a1bb3f82b407bcfa67bd5ea0f883bda43bb7afa3c00eaaa1a269a9408d3f0' 
  AND token = 'Ofa/C9bjIfy7YnHHMEO/Jgngzc1KPUn/u7zMULl4aWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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