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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '618942062f8be028e954df60b28c159f9fb2318a35184e580dc82214d0e04594' 
  AND token = '1JP+MVJn0kbPkYo++wx0odswPupglVtQMFj4sMbthMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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