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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b93bb05b2b7f8784e71225c2aff8fbe5de67db500b90d41c71d90e30fef02c08' 
  AND token = 'ZvV+tttJAcrAv/OORw/Auca67WqXJdCaqOR8Pj6AMrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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