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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e9f40cefbc06d55826bd144ef34b276f291298c7b85fa9156521ac3c5630bc01' 
  AND token = 'ilb74Z3NOyjcLaEJfz+3VAbWWZZhzAsX0lbDyK25TSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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