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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c09203472efeb6d4fce81467fc27d2883aac493fe91dcf9ef835d9d34793ec2f' 
  AND token = 'NifdcUBBct2DX4kZxEh5MiYNbwilXQH5nnCvleb42mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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