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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '65297c8d20b016e2d35df412d1b98f89a9a14b10758aa9001c8ded8c4b4cb4ad' 
  AND token = 'drYxkW4YcyPUOkr9EcJw7seFoOl7A1WPbTAMN4X0EzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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