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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29ebb9c98db820580377c1e1815ee7ea95e26b7b7f901f26bc5cc9c6fbd52ce7' 
  AND token = 'PZcIsfIJbSY9KwsTSaC61yBTqUZzCkZzuNGyX9MqDMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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