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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9958cf0b409fd1bceed984f699d50b16451bfc3f5d5f98cb6caf26baee9c5237' 
  AND token = '/B24yaHHXfxQ2TQGAh7l4xaf4aqW+rpgH9+mFJXtLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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