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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f891aa31510e1319a289fd098deadc085d3566256124121641ae9463f6f12b5' 
  AND token = 'oK5+15kegPrph2orYhb/SP8t1pF4WG3MPPJImwvdsI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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