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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85d98286aa3f2409e55c60c44ed193ad6a737f1c51ad7ac5e415f1d1fe0ed657' 
  AND token = 'vxgMmNivJq9RJ2M8Si2xHTptw8NTofVb0kq24sax3Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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