SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a14812d65578ce19f60c3d692bcb18e645b1315426016228641fe8cc0abd6f7' 
  AND token = 'B/cNUV/Xcbu+9QYWZdGdyDP8cQaTghCDYx8g9XZkVmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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