Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df3d98607d29a000204c6c3e27f0192fc9dbdae9c98b232655c091c0b7cfe0fd' 
  AND token = 'HRWMue3cGkEn50CXgqO9DF49mNulBde8cDMojHyDFVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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