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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '09c3f0806478436b527efa03e65aaad71bbcb7f3a1eef923c5d75510a5a17368' 
  AND token = 'JoZyI74Y5gcAIo5ul4o9h9iANIPqTz9OQ0NsedaA7Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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