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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d5742b786b65e22a3eaf1dcc2aeec1b38df7be76975bbc0d1588b0b1d757d87' 
  AND token = 'm//OTBlN867nv+DIuh7sqPG0CzMhhkSt/CIHWirtQkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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