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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73a69d894b431ca7a9412a09eda52ce0a23be3b839bfa40be38303f021df60aa' 
  AND token = 'Ft/x53JWJJ1NJb+LkWG4gac+QAVaHM14iE2AcSqzCAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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