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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03771796548b8ad01e439926012e2bd3bbaf5464c91d9757e8425e144546b52c' 
  AND token = 'GEL9v37K4dsZitQIJaB2k3JybP4xSCLLs4lI4f28CqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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