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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d0e80197dfb343e5e7fac73d82ea1f92b1eff32fb3e82bb037fe7928fdf080c' 
  AND token = 'dGMDhP3DqXyHApepe9YOqSv2mSu3Hmjs86QPRkv5uqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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