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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8508aa210dfb4602be6ca172d81d12ca3487cad3535312d20ec5522a957082a1' 
  AND token = 'kPSwtK8kuAHrx/bcYqDnild62D5AE2ZxWNrFsFGf3+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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