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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31a3bc1ce1a018aed9f53d28df52d977e2f8816b62332b94ad10a22475e8a210' 
  AND token = 'VwDspFT2/Y0WtTvdc7AK4aiGLtkLgICWqA8E8ORa0O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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