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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5cb34b56af6798733c17e02ab6d82946a4a281cf7de6298c1681f5e5b805170b' 
  AND token = '1rZQaa5Z5bjnKe+E+dLvn1J6uYycK7G3Yvmv0mOoEjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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