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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a50c4019bfd2e48b70d3493b2eedbb88da9567682ae01c805a9f632a25c1e98f' 
  AND token = 'DHJqyat0EYr5m3CdkMd7boeorsQLlF49fiRITD1sCr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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