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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc94d2d62be9b429d7b95e3391d40a6ab992d3d4c691a70ab2daffd37cd9e1b6' 
  AND token = 'wn0V1I2mBKUqT8CLhdv4obDW7qxM7tgD5/99Iqy/3p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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