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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d68b1e44404ca49e4017493e51691000dfa0d22971f1a9cb8fbbf2acc91a169' 
  AND token = 'xLEbDyzYrQOCx3IOCFYnZoqPeWM8s+4DEWQv1ottEdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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