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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd953a33e705b016d671b0e22430b365b10a063dc42689a7a998ae9d0bcec0e95' 
  AND token = 'xEAB+hmeRGR4C/qAbn8ycmCtGs/51H7t9xDDShd6hOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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