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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92e1189ab870c6f4f86721c1a31b9ab2c7c6f4d85df83423f2915857c59d47bf' 
  AND token = 'evWS1kf/jncAgR5jGa6kR1wRUml8HEj3fpLX4aZKkUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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