SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '14807a2a0f7380a6bb433d1dbe28afd7e74b7a7f0d7a82c0d8ed39559973b6d1' 
  AND token = 'lAJokXyCv/D+2zZiwAP5QKL8R7BfRh675dRrgoa2jwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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