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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '637669ae60d0af29971423f51a256d9f3abb0c7dd75c86c6a5ce969a7bb3aab2' 
  AND token = 'j7jXWUkG9aU0EGBT8pMwXMnTSsYZjaRP1hlxe5S3F40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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