SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cfbd087d98da3a2c0b82299a1fb4a1a461653acf763726c1487a2500f4bf5de0' 
  AND token = 'jM18sXy3pWUnHccOFZyYsEG64SsXt05GEYJCJPosKKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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