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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '039f6dcc11e7d78c0a7a91ce219580891bb41f06a59afb4c29485b72d0681feb' 
  AND token = 'GtpxiTW4Huz/pmKXZkkI5S0/MST9HSWRE8YkJ7Sqiuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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