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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b7eab631393c664193e671d383c6e0ad7e883a7d2640706daf0649b103a833e' 
  AND token = 'T4UmtB0aGWSd/99DqU1zX+jAX66Umzskx4JLGeFAyl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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